The sonic screwdriver was a highly versatile tool used by many, but not all, incarnations of the Doctor. While early versions were used mainly for the picking of locks and for projecting sound so as to, for example, detonate bombs, by the time of the Ninth Doctor, the sonic was able to also be used as a sophisticated scanning device, with medical applications. Subsequent incarnations gave it even wider functionality, such as the ability to hack into computers, provide geo-location and actively defend against some types of assault weapon.
We like tracking our DESU round these parts. Only problem is that the show is about a time travelling scientist. And he's spawned shows like DESU that are entirely focussed on alien tech. So there's a lot of tech sittin' around the joint. Be bold, though, and start your journey at category:technology.
When looking for a piece of technology on this wiki, it's helpful to think about some of the broader categories. Looking for the tech of a certain species? Go to technology by species.
The DWU likes its sonic tech, doesn't it? But it's not just the sonic screwdriver you have to keep an ear out for. Don't forget, the Ice Warriors and several other species are heavily invested in sonic technology, which you can find at category:sonic devices.
One of the broadest classifications of technology is communications technology. Since the series is about a guy who likes to talk a lot, we figure that only makes sense!